Mikuni's and Keihin's have vacuum ports with a rubber cap. I don't recall ever seeing these on our garden variety SU's. Rick Sent from my iPad On Sep 1, 2011, at 12:03 PM, Seth Jones <sethamosjones at gmail.com> wrote: > Why not just build this thing? > http://faq.ninja250.org/wiki/How_do_I_synchronize_the_carburetors%3F